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Woodworking Masterclasses

HELP! Problem after Scraping and Sanding a Cutting Board.

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Previous Back to: Wood and Wood Preparation9 Replies

Welcome! / Forums / General Woodworking Discussions / Wood and Wood Preparation / HELP! Problem after Scraping and Sanding a Cutting Board.

Tagged: Cutting Board, quarter-sawn white oak, stain

  • This topic has 9 replies, 7 voices, and was last updated 7 years, 10 months ago by Brett aka Pheasantww.
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  • Matt McGrane
    9 November 2015 at 2:31 am #132150

    Well, I’m just finishing a cutting board for my niece. Bought some nice quarter-sawn white oak and it came out great. That is, until I sanded and then wet the surface to raise the grain. After wiping the surface with a damp rag, I noticed all these dark grain lines in the surface. The second pictures shows it well.

    I am unsure if there was a reaction to the water or if the water removed the sanding dust and revealed that the sandpaper left it’s grit behind in the grain lines. I suspect the latter.

    I tried to remove it by wetting the surface with alcohol and scrubbing with a clean toothbrush, but that had no effect.

    Has anyone had this problem? And if so, what is the fix? I’m probably going to try scraping the surface again to remove it (finally got my #80 to work properly).

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    Andrew Leslie
    9 November 2015 at 3:26 am #132154

    I’ve yet to work in any Oak, so take this with a grain of salt; but, could it simply be that this is one of the characteristics of the wood you’ve used? I definitely don’t think it looks bad, whatever the case.

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    Joe Kaiser
    9 November 2015 at 4:58 am #132159

    Oak is full of tanin and will react easily with iron and water. I don’t know the chemistry off the top of my head, but it does cause into turn black.

    Basically, if you wet the surface and there was any iron dust on the rag, or the wood it will do this. You can use it to your advantage. Soak steel wood in vinegar for a bit. Then apply the “stain” to woods high in tanin. The effect is aged wood.

    Just random thoughts while I eat cake. I am not expert.

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    Wesley
    9 November 2015 at 7:09 am #132163

    Agree with Joe. Maybe the rag wasn’t clean, maybe your hands weren’t clean after sharpening. The same thing happened to me yesterday in a piece of cherry. In my case I was able to plane it out easily.

    Wesley

    • This reply was modified 7 years, 10 months ago by Wesley.
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    Archie
    9 November 2015 at 11:37 am #132167

    First thing’s first, nice job! I would go with a really sharp smoothing plane to take out the stains. And if i remember correctly you should be using food grade mineral oil on the cutting board then sealing it with bees wax.

    Good Luck.

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    Matt McGrane
    9 November 2015 at 9:32 pm #132179

    OK, thanks everybody. I knew about the iron effect with oak tannins. I don’t think I used a dirty rag, but it is possible that the rag I dampened to wipe the cutting board was dirty, possibly with metal dust from sharpening. Or maybe it had been contaminated.

    I’m doing an experiment today on a piece of scrap. One side was sanded (after planing) and the other side was just finish planed. Then I wiped the whole thing with a damp rag. I just went out to the shop to look at it and the sanded side shows some staining. So my conclusion is that my sandpaper is causing the problem. I use silicon carbide wet-dry paper (only dry) that is dark grey in color. Maybe I need to find some light colored Aluminum oxide paper.

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    Peter George
    9 November 2015 at 10:42 pm #132180

    That sounds like it may be the problem. I had the same problem when sanding objects on the lathe. The dark silicon carbon paper would leave dark particles embedded in the wood. This was particularly bad with open pored woods, and from the pictures it looks like the same problem I was having.

    Since then, I’ve reserved the silicon carbide for lapping metal etc.

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    Matt McGrane
    10 November 2015 at 2:11 am #132185

    @pjgeorge – so Peter, did you go to Aluminum Oxide paper for sanding wood and lathe work? Or some other type of sand paper?

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    Peter George
    10 November 2015 at 4:33 am #132231

    Yes, I use aluminum oxide paper. I really like the Norton 3X or the 3M “No Load”. These have a coating which helps prevent the sand paper from clogging and the backing paper is stronger than the regular hardware store stuff. That’s probably less of an issue with hand sanding.

    I mostly only use 220x or finer and a box of 20 sheets lasts a long time.

    • This reply was modified 7 years, 10 months ago by Peter George.
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    Brett aka Pheasantww
    10 November 2015 at 11:02 am #132245

    Matt, When I get pours that fill up with sanding residue I will “paint” on some mineral oil then wipe it right off and poof the residue disappears. It sounds goofy but it works.

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